488 ANNUAL. BEPORT SMITHSONIAN INSTITUTION, 19 31 



mentum and the gula, with the retractor muscles (rst) of the 

 prementum {Pmt) taking their origins upon it. 



REFERENCES 



Cannon, H. G., and Manton, S. M. 



1929. On the feeding mechanism of the syncarid Crustacea. Trans. Roy. 

 Soe. Edinburgh, vol. 56, pp. 175-189, 8 figs. 



Ckampton, G. C. 



1921. The origin and homologies of the so-called " superlinguae " or *' para- 

 glossae" (paragnaths) of insects and related arthropods. Psyche, vol. 

 28, pp. 84-92, pi. 5. 

 1928. The eulabium, mentum, submentum, and gular region of insects 

 Jouru. Ent. Zool., vol. 20, pp. 1-15, 3 -pis. 

 Denis, J. R. 



1928. fitudes sur I'anatomle de la tete de quelques Collemboles. Arch. Zool. 

 Exp. G6n., vol. 68, pp. 1-291, 66 figs. 

 Eastham, L. E. S. 



1930. The embryology of Pieris rapae. — Organogeny. Phil. Trans. Roy. 

 Soc. London, ser. B, vol. 219, pp. 1-50, pis. 1-9. 



FOLSOM, J. W. 



1900. The development of the mouth-parts of Anurida maritima. Bull. 

 Mus. Comp. Zool., vol. 36, pp. 87-157, pis. 1-8. 



Hansen, H. J. 



1930. Studies on Arthropoda. III. On the comparative morphology of the 

 appendages in Arthropoda, 376 pp., 16 pis. Copenhagen. 



Han STROM, B. 



1928. Vergleichende Anatomie des Nervensystems der wirbellosen Tiere, 

 628 pp., 650 figs. Berlin. 



Henbiksen, K. L. 



1929. Contribution to the interpretation of the cephalic se'gments of 

 Arthropoda. IV. Internat. Cong. Ent., Ithaca, vol. 2, pp. 489-593. 



Heymons, R. 



1897. Entwicklungsgeschichtliche Untersuchungen an Lepisma saccharina L. 

 Zeitschr. wiss. Zool., vol. 62, pp. 581-631, pis. 29, 30. 



1901. Die Entwicklungsgeschichte der Scolopender, Zoologica, Orig-Abhandl. 

 Gesamt. Zool., vol. 33, 244 pp., 8 pis. 



Hoffman, R. W. 



1911. Zur Kenntnis der Entwicklungsgeschichte der CoUembolen. Zool. Anz., 

 vol. 37, pp. 353-377, 7 figs. 

 Holmgren, N. 



1909. Termitenstudien 1. Anatomische Untersuchungen. Kungl. Sven. 



Vetenskapsakad. Handl., vol. 44, 215 pp., 3 pis. 

 1916. Zur vergleichenden Anatomie des Gehirns von Polychaeten, Ony- 

 chophoren, Xiphosuren, Arachniden, Crustaceen, Myriopoden, und Insek- 

 ten. Kungl. Sven. Vetenskapsakad. Handbl., vol. 56, No. 1, 303 pp., 12 pis. 

 HussEY, Prisciixa B. 



1926. Studies on the pleuropodia of Belostoma flumineum Say and Ranatra 

 fusca Palisot de Beauvais. Entomologica Americana, vol. 7, pp. 1-59, 

 pis. 1-11. 

 Imms, a. D. 



1931. Recent advances in entomology, 374 pp., 84 figs. Philadelphia. 



